Noel Gallagher could probably afford a limo - or four - but the the low-key rocker decided to take the public transport last night.

The former Oasis star might be a millionaire several times over - but flashy cars aren't exactly his style and sitting with his head down and holding onto his iPhone, the 48-year-old looked like any other normal commuter on London's Underground on Monday evening.

It didn't even look like the people around him realised they were sitting with a musical legend, aside from the person who snapped the sneaky photo.

The High Flying Birds frontman was spotted on his way to London's 02 Arena where he joined U2 on stage for a surprise duet.

Video Loading

Video Unavailable

Click to playTap to play

The video will start in 8Cancel

Play now

The 48-year-old thrilled fans with his appearance alongside Bono, to perform 'I Still Haven't Found What I'm Looking For' and a cover of the Beatles' 'All You Need Is Love'.

Noel isn't exactly a stranger to the tube and regularly is spotted by excited fans on the underground.